Taken By The Orc General

Her supercollider reopened a portal between Earth and mythical realms. Now mated to their fierce warlord, can their love bridge two colliding worlds?
When quantum physicist Dr. Rianna Goodwin ignores warnings and opens a black hole with the supercollider, the experiment accidentally tears open a portal between Earth and mythical realms that was sealed off centuries ago by human witches. As Mythic Alphas in search of their Omegas flood through, Rianna catches the eye of Halox, the orcs' Supreme General, who claims her as his mate. Compelled by a mystical bond she doesn't understand, Rianna navigates a dangerous new world as she becomes an Omega and surrenders to an intense attraction she can't deny. With humanity on the brink, she and Halox must bridge the divide between their peoples before a looming supernatural threat consumes them all.

This is a spicy fantasy romance featuring fated mates, enemies to lovers, a possessive Alpha hero, and an independent, intelligent woman, who refuses to be subservient. Since it's part of a planned series, there are some plot lines not resolved, but the main romance between Rianna and Halox ends with a HEA.